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Can low NOx burners support London’s clean air commitment


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anaging air quality is a significant concern for urban areas worldwide due to the adverse health effects associated


with air pollution, where many large cities have faced notable challenges regarding air quality management. London’s approach to managing air quality


involves a combination of regulatory measures, incentives for cleaner transport options, and investments in sustainable infrastructure. These efforts are aimed at reducing emissions, improving public health, and creating a cleaner and more sustainable urban environment.


Ultra Low Emission Zone


One of London’s most significant initiatives is the Clean Air Act and Ultra Low Emission Zone (ULEZ), which was introduced in April 2019. The ULEZ aims to reduce harmful emissions, particularly nitrogen dioxide (NO2) and particulate matter (PM10), by setting strict emission standards for those located within – or those entering – the zone. However, it isn’t just vehicles affecting air quality,


large buildings can impact NOx (nitrogen oxides) levels through various sources, primarily from combustion processes and emissions related to energy generation and heating. Therefore, it makes sense that buildings within the ULEZ – such as hospitals – should reconsider their combustion processes and incorporate low NOx solutions where possible. Hospitals may not just use boilers; they may use other heating systems such as furnaces or space heaters. These systems, if not properly maintained or equipped with emission control technology, can contribute to NOx emissions. Riello in recent years has developed a comprehensive range of low NOx burners4 tailored to achieve superior performance, efficiency, and environmental responsibility across various heating applications. From oil to gas, dual-fuel to pre-mix setups, each solution is engineered for maximum efficiency and reduced environmental impact.


Low NOx emissions


Burner, boiler combinations that meet low NOx emission standards typically comply with regulations set by environmental agencies. These regulatory standards set maximum allowable NOx emissions levels for boilers – measured in parts per million (ppm) or grams per kilowatt-hour (g/ kWh) – depending on the jurisdiction and specific regulations. A boiler system classified as low NOx can be relied upon to emit NOx levels below 80 milligrams per normal cubic meter (mg/Nm³) during combustion.


18 September 2024


As legislation continues to drive down permissible NOx emission levels from combustion equipment, we speak to Graham Barker, burner sales and service director at Riello, Carrier RLC EMEA, about the importance of addressing emissions management and how ultra-low NOx burner solutions can help create cleaner, more sustainable urban environments


Ultra-low NOx emissions


Ultra-low NOx emissions refer to burner, boiler combinations that surpass standard low NOx emissions requirements, achieving even lower levels of NOx emissions. These systems are designed to emit NOx at significantly reduced levels compared to traditional boiler systems. The Greater London Authority (GLA) benchmarks


Ultra Low NOx emissions as <40mg/kWh (gross CV) for their targets. A boiler system classified as Ultra low NOx can be relied upon to emit NOx below these levels during the combustion process. Ultra-low NOx burners employ advanced


combustion technologies, such as internal and/or external flue gas recirculation, staged combustion or selective catalytic reduction (SCR), to achieve NOx emissions levels well below regulatory limits.


Optimising heating solutions


In a bustling metropolis like London, where every aspect of hospital operations demands efficiency and reliability, the choice of boiler setup is critical. For a large hospital in London’s ULEZ, an optimal solution for space heating, linen services, and instrument sterilisation could include: Space heating: For the vast expanse of the hospital complex, a reliable heating system is paramount to ensure patient comfort, staff productivity, and operational efficiency. A hospital may opt for a combination of burners from our RLS/E and RLS/ EV series7. The RLS range are dual fuel monobloc burners that can provide security of heat due to the simplicity of switching from one fuel to another. The RLS/E and RLS/EV series predominantly utilises natural gas as the main fuel source with oil as a back-up, however they also support the use of


renewable liquid fuels to be used as the back-up – or main fuel source – alongside dual gas options. With their modular, monobloc structure and high modulation ratio, these burners offer precise control overheating output, ensuring consistent warmth throughout the premises. This flexibility allows seamless integration with the hospital’s existing infrastructure, providing reliable Low NOx heating for wards, corridors, and administrative areas alike. Linen services: Efficient and hygienic linen services are crucial for maintaining the hospital’s cleanliness standards and ensuring patient well-being. To meet the demands of laundering large volumes of linens daily, the hospital could employ a combination of hot water and steam boilers powered by the RLS series burners. With their high efficiency levels and modulating operation, they would guarantee optimal performance while minimising energy consumption. This setup ensures a constant supply of hot water at the precise temperature required for effective laundry operations, contributing to the hospital’s overall sustainability efforts. Sterilisation: Equipment sterilisation is vital in maintaining stringent hygiene standards and safeguarding patient health. To enhance sterilisation efficiency while adhering to emissions regulations, the hospital could integrate advanced low NOx burner technology into its sterilisation set up. By implementing low NOx burner solutions in sterilisation equipment, the hospital shows it is committed to sustainability and patient safety, aligning with London’s clean air initiatives and paving the way for healthier urban environments. Training: The burners suggested do not require major training for engineers, they use the same familiar components and remain easy to use and service. Meaning with little upheaval during the upgrade process, the hospital can achieve optimal performance across its diverse heating needs while upholding its commitment to efficiency, reliability, and environmental responsibility.


Overall emissions management


Riello has developed and can now offer patented RS ULX Ultra Low NOx burner models that provide industry leading low NOx emissions. These burners can be used on new appliances or retrofitted onto existing plant to reduce NOx emissions and allow compliance with more stringent requirements.


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